<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>while语句</title>
    <style>
        td{
            border: 1px solid rebeccapurple;
        }
    </style>
    <script>

      /* //1 ~ 100 求和  5050

        var sum = 0;
        var num = 1;

        while(num <= 100){
            sum += num;
            num ++;
        }
        alert(sum);
        alert(num);
*/
        document.write("<table align='center' >");

      for(var i = 1; i <= 9; i++) {
          document.write("<tr>");
          for (var j = 1; j <=i ; j++) {
              document.write("<td>");
              document.write(i + " * " + j + " = " + ( i*j) +"&nbsp;&nbsp;&nbsp;");
              document.write("</td>");
          }
          document.write("</tr>");

      }
        document.write("</table>");
    </script>
</head>
<body>

</body>
</html>